Q.If $f(x) = \begin{cases} \frac{\sqrt{1 + kx} - 1}{x} & x \ne 0 \ k/2 & x = 0 \end{cases}$ is continuous at $x=0$ , then $k$ equals

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Q.If f(x)={1+kx−1xx≠0 k/2x=0f(x) = \begin{cases} \frac{\sqrt{1 + kx} - 1}{x} & x \ne 0 \ k/2 & x = 0 \end{cases}f(x)={x1+kx​−1​​x=0 k/2​x=0​ is continuous at x=0x=0x=0, then kkk equals